Portal vein (PF) and superior mesenteric artery blood flows (SMAF), arterial and portal venous oxygen concentrations were measured in dogs before and after duodenal introduction of 3 ml/kg 0.1 mol HCl. The duodenal acidification increased PF by 30% and SMAF by 35%. The change of mesenteric oxygen utilisation, from 0.80 +/- 0.10 to 0.81 ml/kg was not significant. It is concluded that the circulatory changes after acidification of the duodenal contents are not secondary to a metabolic effect.
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